Ser. Melanosperme*. Fam. Fueea. 



Plate CLVIII. 



FUCUS NODOSUS, Lim. 



Gen. Char. Frond linear, either flat, compressed, or cylindrical, dichoto- 

 mous (rarely pinnated), coriaceous. Air-vessels, when present, innate, 

 simple. Receptacles either terminal or lateral, filled with mucus 

 traversed by a net- work of jointed fibres, pierced by numerous pores, 

 which communicate with immersed, spherical conceptacles, containing 

 parietal spores, or anther id la, or both. Fucus {L.), — from (frvKos, a 

 Sea-weed. 



Fucus nodosus ; frond compressed, without distinct rib, leathery, sub- 

 dichotomous ; branches strap-shaped, somewhat pinnated, attenuate at 

 base, remotely toothed, here and there swelling into oblong air-vessels ; 

 receptacles lateral, ovate, stalked, springing from the axils of the mar- 

 ginal teeth. 



Fucus nodosus, Linn. Sp. PI. p. 1628. Fl. Suec. p. 431. Fl. Lapp. p. 366. 

 LigMf. Fl. Scot. vol. ii. p. 918. Hnds. Fl. Ang. p. 584. With. vol. iv. p. 84. 

 Stack. Ner. Brit. p. 35. t. 10. Fl. Ban. t. 146. E. Bot. t. 570. Esper, 

 p. 25. t. 7. and p. 118. t. 60. Gm. Hist. t. 1. B. f. 1. Turn. Syn. p. 252. 

 Turn. Hist. t. 91. Lamour. Ess. p. 19. Ag. Sp. Alg. vol. i. p. 85. Ag. Sijst. 

 p. 275. Hook. Fl. Scot. part. 2. p. 94. Grev. Fl. Edin. p. 234. Spr. Syst. 

 Veg. vol. iv. p. 316. Grev. Alg. Brit. p. 16. Hook. Br. Fl. vol. ii. p. 268. 

 Wyatt, Alg. Danm. no. 154. Hare, hi Mack. Fl. Hib. part 3. p. 169. 

 Harv. Man. p. 21. Endl. 3rd Suppl. p. 29. 



Halidrys nodosa, Lyngb. Ilyd. Dan. p. 37. t. 8. 



Physocaulon nodosum, Kiitz. Phyc. Gen. p. 352. 



Ozothallia vulgaris, Due. in sin. Sc. Nat. 1845. p. 13. 



Hab. Growing on sub-marine rocks and large boulder si ones, from ordinary 

 high-water mark to half-tide level. Perennial. Winter and Spring. 

 Very common. 



Geogr. Distr. Atlantic shores of Europe and North America. 



Descr. Root a hard, conical disc, one or two inches in diameter. Fronds tufted, 

 from two to four or six feet in length, from a quarter to half an inch or more 

 in width, compressed, two-edged, thickened into an obscure rib in the 

 middle, especially in older parts, linear, once or twice forked at considerable 

 intervals, remotely toothed at the margin. From the axils of the teeth 

 spring lateral, distichous branches similar to the main frond, toothed and 

 again once or twice pinnated with smaller branches, which are either simple 

 and lanceolate or cuncitr and forked ; or furnished, in place of branchlets, 

 with solitary or tufted receptacles. All the divisions of the frond are very 



much attenuated at base, and more or less acute at the apex. Vesicles one 

 to two inches long, oval-oblong, formed at intervals in the principal stem 

 and branches; rarely absent. Receptacles springing from the axils of the 



marginal teeth, ovate, raised on -lender stalks, from half an inch to upwards 

 of an inch in Length, bright yellow when ripe, two or more often issuing 



